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On another forum that I frequent there is a self proclaimed "expert" that insists that one can increase the HP of a stock bike by as much a 20% by doing 3 modifications: new pipes, adding an air kit and a fuel management system such as Power Commander V. My contention is that 20% is way too much any increase from those mods would be more likely in the 10% area. BTW he is talking about doing this on a Yamaha 1300......What do you guys think?
Phil
When in doubt, poke it with a stick.
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Junior Member
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His claim sounds a bit simplistic to me... maybe on certain bikes that are tuned for midrange instead of top end by the factory. The Yamaha 1300 is most likely a bit this way. Also there is the matter of losing power from the bottom to put more at the top and driveability issues. If you haven't guessed by now I'm a charter member of the if you don't want to walk, leave it stock club.
Wife,R1,Kendon,Mountaineer,Alpinestars,Levis,Bose
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Capri142 (1/12/2010)
On another forum that I frequent there is a self proclaimed "expert" that insists that one can increase the HP of a stock bike by as much a 20% by doing 3 modifications: new pipes, adding an air kit and a fuel management system such as Power Commander V. My contention is that 20% is way too much any increase from those mods would be more likely in the 10% area. BTW he is talking about doing this on a Yamaha 1300......What do you guys think?
Phil "As much as 20%" is possible, but 5-10% is much more likely. Factory engine tuning(not just control, but exh/int flow as well) is a balancing act between performance, noise level, noise quality, emissions, req'd maintenance, and price. The idea is to sell bikes/cars(doesn't matter in principle), so the goal is adequacy in all areas, and a lack of any factor that might be prohibitive to a buyer. People are odd...I've seen new Corvette owners that complain that their $70k Z06 only uses premium -and that's just too expensive, so I'm gonna run regular anyway!(LOL). I've done a performance intake/exh package on fullsize truck that gave it 3mpg and 25hp, and had the customer insist on removing it because the intake was noisy at WOT.("Are you sure? I mean, how often are you at WOT?"..."I don't like the sound.", "Okee dokee."  Because of this, we usually don't see K&N filters, better-flowing exhausts, etc, that could give us that power from day 1...because stock power is adequate for most buyers, and the vehicle is as un-offending as possible -nobody is put off the sale. Anyway, back on topic: Yes, you can get a good gain from those mods. 20% is possible, but rare. Exactly how much depends on more factors than I have motivation to type -every combination has a different result. I haven't done enough Yam1300 perf work to say whether it is loaded with untapped hp or not. Aftermarket performance intakes/exhausts generally flow better, and moving air in and out is what it's all about. The reprogram doesn't make power by itself unless the factory map is really crappy to begin with, but is necessary due to the airflow mods.
Minivans. Why is it ALWAYS the minivans?
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[quote]Also there is the matter of losing power from the bottom to put more at the top and driveability issues. If you haven't guessed by now I'm a charter member of the if you don't want to walk, leave it stock club.
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I can't comment on sport bikes, but on Harley's that typically does not happen unless you make a poor choice in exhaust (I.E. Drag pipes). Often you end up increasing the power across the entire powerband. Typically the bottom rev range will match stock output and the higher rev range will greatly exceed stock output. You are more likely to give up power in the lower rev range when you start to swap out cams for more aggressive profiles.
I agree with deadman. It depends on the machine how much power can be attained and you can maximize the results with good tuning and choosing an exhaust that works well with the other stock internals.
On Sportsters you can get 15-25% more power over stock with those changes.
On a Yam 1300????? I would suggest finding a forum specific to that motorcycle and looking at the power gains posted by owner's who did those modifications.
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| If you haven't guessed by now I'm a charter member of the if you don't want to walk, leave it stock club. (quote) +1
"Life's journey is not arriving at the gate safely in a well perserved body, but rather to skid-in-sideways, totally worn out, shouting...holy *...what a ride!"
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[quote]If you haven't guessed by now I'm a charter member of the if you don't want to walk, leave it stock club. (quote)
+1
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That really depends on the type of modifications on how you do them. It can range to having zero impact on stock reliability to significantly shortening the life of the engine. There are some talented people out there that do good work, but there are several hacks out there too.
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I have to agree on the reliability issue. I also find that in most cases the cost spent is not worth the few horses you gain. Also it can hurt your resell value.
Torqueman
Battle Creek, MI
V-Strom 06
Goldwing 03
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| Aaahhh, if you want your bike to feel as though it has 20% more power, and want to save a lot of bucks, just ARMORALL the seat! Instant 20% more power!
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trauscher1 (1/14/2010)
Aaahhh, if you want your bike to feel as though it has 20% more power, and want to save a lot of bucks, just ARMORALL the seat! Instant 20% more power! LMAO 
Minivans. Why is it ALWAYS the minivans?
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